It's not much of a reaction, but it certainly breaks the mood. Goro's eyes widen, and his hands stutter over the foaming coffee grounds as he turns pink. But then he just laughs, lifting the kettle expertly to cut off the first flow of water.

"Goodness me. I didn't quite think you'd go there." If he hadn't already been half-picturing Ren when he said that, he might have jumped.